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Carmex Carbide Tiny Tool - Boring Bar - MTR - K20 Grade - 8.1mm Minimum Diameter x 35mm Reach x R0.2
| Application | Boring (MTR) |
| Minimum Diameter | 8.1 |
| Reach (L1) | 35 |
| Radius (R) | 0.2 |
| Grade | K20 |
| Holder | SIM****H8 |
Learn more about Klarna
The Carmex Carbide Tiny Tool is a compact boring bar built from MTR K20 grade solid carbide. Designed for small-diameter bores and tight pockets, it also handles general turning tasks with consistent results. It features an 8.1 mm minimum diameter, 35 mm reach, and a nose radius of R0.2 for precise, repeatable finishes.
Available in two coated grades, it adapts to different materials and speeds: BXC, a PVD TiN-coated option optimized for low cutting speeds on a broad range of stainless steels (ISO P30-P50 / K25-K40); and BMK, a sub-micron grade with an advanced PVD triple coating offering extremely high heat resistance and smooth cutting for general-purpose use across materials.
- Two coated grades for versatile materials: Choose BXC TiN for low-speed cutting on stainless steels or BMK with triple PVD coating for broad-material use and enhanced wear resistance.
- High-heat resistance with smooth cutting: BMK’s advanced coating provides excellent heat tolerance and a smooth cutting experience for demanding jobs.
- Compact bore-ready geometry: 8.1 mm minimum diameter, 35 mm reach, and R0.2 nose radius enable stable cuts in tight bores and predictable finishes.
Whether you’re reducing downtime in small-bore work or refining finishes during turning operations, the Carmex Tiny Tool delivers dependable, repeatable results. The solid carbide core provides rigidity and wear resistance, while the coating options optimize cutting performance and heat management for stainless steels and other materials. With straightforward setup and consistent results, it’s a reliable choice for engineers, machinists, and shop floors alike.
| Application | Boring (MTR) |
| Minimum Diameter | 8.1 |
| Reach (L1) | 35 |
| Radius (R) | 0.2 |
| Grade | K20 |
| Holder | SIM****H8 |
| L | 76 |
| F | 3.8 |
| D | 8 |
What time are Protool open?
We are open Monday to Friday between 8:30am and 5pm.
Do you offer Free Next Day delivery?
Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.
We also offer the following:
- Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
- DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
- Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
- DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.
For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.
*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.
